Battery module and battery pack

Abstract

The utility model relates to the field of batteries, and provides a battery module and a battery pack. The battery module comprises a first battery cell group which comprises a plurality of first battery cells, and the plurality of first battery cells are stacked along the longitudinal direction; the second battery cell group comprises a plurality of second battery cells, and the plurality of second battery cells are stacked along the transverse direction; the first epoxy plate is arranged on one side of the first battery cell group and one side of the second battery cell group, and the first tab of the first battery cell group and the second tab of the second battery cell group are welded on the first epoxy plate. According to one embodiment of the utility model, the outer sides of the first battery cell group and the second battery cell group are coated with polyurethane foam, and the outer side of the polyurethane foam is bonded with a second epoxy plate. According to the battery module, the space can be more effectively utilized, and the overall energy density is improved; different equipment requirements are met; the internal structure and the connection mode of the battery module are simplified; the uniform distribution and rapid dissipation of heat are facilitated; the production efficiency and the product quality are improved; and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of batteries and provides a battery module and a battery pack. Background Art

[0002] At present, the new energy power battery industry is booming. In battery modules, most design schemes are to arrange an even number of cells neatly and connect them, and the cell tabs are welded on the PCB board through the PCB board; or use bracket buckles to complete the stacking and fixing of the cells, which is costly and has a complex structure. The existing implementation scheme requires an even number of cells and a regular structure, but the space utilization rate is insufficient, and the cost of materials such as PCB boards and polyurethane foam is high, and disassembly is complicated. Utility Model Content

[0003] The embodiment of the utility model provides a battery module to solve the defects of low space utilization and high cost of the battery module in the related art, thereby achieving full utilization of space and reducing costs.

[0004] The embodiment of the utility model also provides a battery pack.

[0005] The first embodiment of the present invention provides a battery module, comprising:

[0006] A first battery cell group includes a plurality of first battery cells, wherein the plurality of first battery cells are stacked in a longitudinal direction;

[0007] A second battery cell group includes a plurality of second battery cells, wherein the plurality of second battery cells are stacked in a transverse direction;

[0008] The first epoxy board is arranged on one side of the first battery cell group and the second battery cell group, and the first electrode tab of the first battery cell group and the second electrode tab of the second battery cell group are welded to the first epoxy board.

[0009] According to an embodiment of the present invention, the outer sides of the first battery cell group and the second battery cell group are coated with polyurethane foam, and the outer sides of the polyurethane foam are bonded with a second epoxy board.

[0010] According to an embodiment of the present invention, EVA foam is bonded to the outer side of the second epoxy board.

[0011] According to an embodiment of the present invention, a bracket is provided on the outer side of the first battery cell group, and a communication board and a protection board are detachably connected to the bracket.

[0012] According to an embodiment of the present invention, silicon foam is arranged between two adjacent first battery cells and / or between two adjacent second battery cells.

[0013] According to an embodiment of the present invention, an isolation plate is provided between the first battery cell group and the second battery cell group.

[0014] According to an embodiment of the present invention, the first epoxy board is provided with wire-passing holes, and the number of the wire-passing holes corresponds to the number of the first battery cells and the second battery cells.

[0015] According to an embodiment of the present utility model, a busbar is installed on the first epoxy board, and the first pole lug and the second pole lug are connected to the busbar.

[0016] According to an embodiment of the utility model, a wiring harness terminal is connected to the busbar.

[0017] A second aspect of the present invention provides a battery pack, comprising the above-mentioned battery module.

[0018] According to the battery module provided by the embodiment of the first aspect of the utility model, by designing that the first battery cell group is stacked longitudinally and the second battery cell group is stacked transversely, the battery module can more effectively utilize space and improve the overall energy density. This layout can be optimized according to the specific application scenario and battery size requirements to adapt to different equipment requirements. The first pole ear of the first battery cell group and the second pole ear of the second battery cell group are directly welded to the first epoxy board. This design simplifies the internal structure and connection method of the battery module, reduces potential failure points and connectors, and thus improves the overall reliability of the battery module. Due to the stacking method of the battery cells and the setting of the epoxy board, a more reasonable heat dissipation channel is formed inside the battery module, which helps to evenly distribute and quickly dissipate heat, thereby improving the working performance and safety of the battery module in a high temperature environment. The stacking of the battery cells and the welding of the pole ears can be automated on the production line, improving production efficiency and product quality. At the same time, due to the simplified and standardized structure, the maintenance and replacement of the battery module are also more convenient and quick. The design of the battery module has good scalability, and the number of battery cell groups can be increased or decreased or the stacking method of the battery cells can be adjusted as needed to meet application scenarios with different capacity and performance requirements.

[0019] According to the battery pack provided by the embodiment of the second aspect of the utility model, due to the stacking design of the battery cells inside the battery module, the entire battery pack can accommodate more battery cells in a limited volume, thereby improving the energy density of the battery pack and meeting the power requirements of high-performance equipment. The structural design inside the battery module helps to evenly distribute and quickly dissipate heat, which enables the battery pack to maintain a lower temperature when working under high load, prolong battery life, and improve safety performance. The battery pack can further improve the safety performance of the battery pack and reduce safety accidents caused by battery failure by adding safety measures such as thermal management system and overcharge and over-discharge protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a schematic exploded diagram of the battery module provided by the utility model.

[0022] Figure 2 This is a schematic structural diagram of the battery module provided by the utility model

[0023] Figure 3 A schematic cross-sectional view of a battery module provided by the utility model.

[0024] Figure 4 It is a schematic structural diagram of the first epoxy board provided by the utility model.

[0025] Figure 5 It is a schematic structural diagram of the first electrode, the second electrode and the first epoxy board provided by the utility model.

[0026] Figure 6 It is a schematic cross-sectional view of the battery pack provided by the utility model.

[0027] Reference numerals:

[0028] 100, first battery cell group; 102, first battery cell; 104, second battery cell group; 106, second battery cell; 108, first epoxy board; 110, polyurethane foam; 112, second epoxy board; 114, EVA foam; 116, bracket; 118, communication board; 120, protection board; 122, silicon foam; 124, wire hole; 126, bus bar; 128, wiring harness terminal. DETAILED DESCRIPTION

[0029] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0030] like Figures 1 to 5As shown, the first embodiment of the utility model provides a battery module, including a first battery cell group 100, a second battery cell group 104 and a first epoxy board 108; the first battery cell group 100 includes a plurality of first battery cells 102, and the plurality of first battery cells 102 are stacked in the longitudinal direction; the second battery cell group 104 includes a plurality of second battery cells 106, and the plurality of second battery cells 106 are stacked in the transverse direction; the first epoxy board 108 is arranged on one side of the first battery cell group 100 and the second battery cell group 104, and the first pole ear of the first battery cell group 100 and the second pole ear of the second battery cell group 104 are welded to the first epoxy board 108.

[0031] According to the battery module provided by the embodiment of the first aspect of the utility model, by designing that the first battery cell group 100 is stacked longitudinally and the second battery cell group 104 is stacked transversely, the battery module can more effectively utilize space and improve the overall energy density. This layout method can be optimized according to the specific application scenario and battery size requirements to adapt to different equipment requirements. The first pole ear of the first battery cell group 100 and the second pole ear of the second battery cell group 104 are directly welded to the first epoxy board 108. This design simplifies the internal structure and connection method of the battery module, reduces potential failure points and connectors, and thus improves the overall reliability of the battery module. Due to the stacking method of the battery cells and the setting of the epoxy board, a more reasonable heat dissipation channel is formed inside the battery module, which helps to evenly distribute and quickly dissipate heat, thereby improving the working performance and safety of the battery module in a high temperature environment. The stacking of the battery cells and the welding of the pole ears can be automated on the production line, improving production efficiency and product quality. At the same time, due to the simplified and standardized structure, the maintenance and replacement of the battery module are also more convenient and quick. The design of the battery module has good scalability, and the number of battery cell groups can be increased or decreased or the stacking method of the battery cells can be adjusted as needed to meet application scenarios with different capacity and performance requirements.

[0032] Please continue to see Figures 1 to 5 The first embodiment of the utility model provides a battery module, the design of which is intended to optimize the internal structural layout of the battery and improve energy density and safety.

[0033] The first battery cell group 100 is composed of a plurality of first battery cell groups 102 , and the first battery cells 102 are stacked in the longitudinal direction to form a compact columnar structure. Such a design can effectively utilize the vertical space and increase the capacity of the battery module.

[0034] The second battery group 104 is different from the first battery group 100 in that the second battery group 104 is stacked horizontally. This means that the second battery cells 106 are arranged in a horizontal direction, in contrast to the vertical stacking of the first battery group 100. This design helps to balance the stress distribution inside the module, reduce the risk of deformation, and also provides layout flexibility.

[0035] As one of the key components of the battery module, the first epoxy board 108 is arranged on one side of the first battery cell group 100 and the second battery cell group 104. The epoxy board has good insulation performance and mechanical strength, and can protect the battery cells from external impact and short circuit risks. At the same time, the first pole ear of the first battery cell group 100 and the second pole ear of the second battery cell group 104 are welded to the first epoxy board 108, realizing a stable connection between the battery cells.

[0036] Through the design of vertically and horizontally stacked cells, the battery module can accommodate more cells in a limited volume, thereby significantly improving the energy density, which is particularly important for devices that require high energy output. At the same time, the space utilization of the first cell group 100 and the second cell group 104 is also improved. That is, due to the reasonable layout of the cell stacking method, the space inside the module is effectively utilized, which is conducive to the dissipation of heat. This helps to keep the battery module within the optimal operating temperature range and extend the service life.

[0037] The introduction of the first epoxy plate 108 not only provides protection for the battery cell, but also reduces the risk of short circuit and fire through insulation and isolation functions. In addition, the welding connection method also reduces the risk of failure caused by looseness or poor contact.

[0038] Simplified structure: By using epoxy plates and welding connections, the structure of the battery module is simplified, reducing unnecessary components and connectors. This not only reduces manufacturing costs, but also improves the reliability and stability of the module. The simplification and standardization of the battery module structure makes it easier to maintain and replace batteries. When repairs or replacements are needed, problems can be quickly located and solved, reducing downtime.

[0039] According to an embodiment of the present invention, the outer sides of the first battery cell group 100 and the second battery cell group 104 are coated with polyurethane foam 110 , and the outer side of the polyurethane foam 110 is bonded with a second epoxy board 112 .

[0040] like Figure 1 As shown, the outer sides of the first battery cell group 100 and the second battery cell group 104 are tightly wrapped by a layer of polyurethane foam 110. As an excellent buffer material, the polyurethane foam 110 can effectively absorb and disperse external impacts and provide additional protection for the battery cells.

[0041] The addition of the polyurethane foam 110 enables the battery module to be effectively buffered and protected when subjected to external impact, thereby reducing the risk of damage to the battery cell.

[0042] A second epoxy board 112 is fixed to the outside of the polyurethane foam 110 by bonding. The second epoxy board 112 also has good insulation performance and mechanical strength, and can further protect the battery cell group from the influence of the external environment. In addition, it can also enhance the structural strength of the entire battery module and improve the overall stability and reliability of the module.

[0043] The second epoxy plate 112 acts as an external protective layer, further enhancing the insulation performance of the battery module and reducing the safety risks caused by electrical faults such as short circuits. The second epoxy plate 112 not only has a protective effect, but also can enhance the structural strength of the entire battery module, making it more stable and reliable.

[0044] In addition, the combined design of the polyurethane foam 110 and the second epoxy plate 112 enables the battery module to better adapt to various complex working environments, such as high temperature, low temperature, and humid environments. Since the entire battery module is tightly wrapped by the polyurethane foam 110 and the second epoxy plate 112, damage and failure caused by external environmental factors can be reduced, thereby simplifying the maintenance process and reducing maintenance costs.

[0045] According to an embodiment of the present invention, EVA foam 114 (ethylene-vinyl acetate copolymer foam) is bonded to the outer side of the second epoxy board 112 .

[0046] like Figure 1 and Figure 2 As shown, in one embodiment of the utility model, the outer side of the second epoxy plate 112 is further bonded by EVA foam 114. This design choice not only enhances the multiple protection functions of the battery module, but also further improves its performance in practical applications. EVA foam 114 provides additional buffering and shock resistance for the battery module with its excellent softness and rubber-like elasticity. This material can still maintain good flexibility at minus 50 degrees Celsius, good transparency and surface gloss, excellent chemical stability, good anti-aging and ozone resistance, and non-toxicity. EVA foam 114 itself has excellent electrical insulation (especially high-frequency insulation), and is used in combination with the second epoxy plate 112 to further improve the insulation performance of the battery module. At the same time, its moisture-proof performance can also help the battery module better adapt to humid environments. Although the thermal conductivity of EVA foam 114 is not as good as some metal materials, its good air permeability and thermal stability help the battery module maintain good heat dissipation performance during continuous operation, thereby extending the battery life. The addition of EVA foam 114 makes the battery module more stable in structure and reduces the risk of damage caused by external impact or vibration. As an environmentally friendly material, EVA foam 114 has the characteristics of biodegradability and relatively little harm to the environment. At the same time, its repeated recycling characteristics also meet the current requirements of sustainable development.

[0047] According to an embodiment of the present invention, a bracket 116 is disposed on the outer side of the first battery cell group 100 , and a communication board 118 and a protection board 120 are detachably connected to the bracket 116 .

[0048] like Figure 1 As shown, in one embodiment of the present invention, a bracket 116 is designed on the outside of the first battery pack 100. The bracket 116 is not only used to support and protect the battery pack, but also provides an interface or structure for detachably connecting the communication board 118 and the protection board 120. Such a design greatly improves the functionality and maintainability of the battery module.

[0049] The bracket 116 provides a stable support for the first battery cell group 100, and can prevent the battery cell group from being damaged by external impact or extrusion to a certain extent. This design ensures the safety and stability of the battery cell group in a complex environment. The bracket 116 is designed with an interface or slot that matches the communication board 118, so that the communication board 118 can be easily and quickly installed or removed. The communication board 118 is usually used for data exchange and communication between the battery module and an external device or system, and its detachability facilitates maintenance and upgrading. Similar to the communication board 118, the protection board 120 is also detachably connected through the interface or slot on the bracket 116. The protection board 120 is mainly used to prevent the battery cell group from being corroded by external pollutants such as dust and moisture, and can also prevent the battery cell group from being damaged in abnormal conditions such as overcharging, over-discharging, and short circuits to a certain extent. Since both the communication board 118 and the protection board 120 are detachably connected, when these components fail or need to be upgraded, the user can easily remove and replace or upgrade them, which greatly improves the maintainability and scalability of the battery module. By rationally designing and configuring the components such as the bracket 116, the communication board 118 and the protection board 120, the battery module of this embodiment is comprehensively improved in performance. It not only has higher safety, stability and reliability, but also can meet the needs of various complex application scenarios.

[0050] According to an embodiment of the present invention, a silicon foam 122 is disposed between two adjacent first battery cells 102 and / or between two adjacent second battery cells 106 .

[0051] like Figure 3 As shown, in the battery module, a silicon foam 122 is arranged between two adjacent first battery cells 102. Such a design can effectively fill the gaps between the battery cells, prevent direct contact between the battery cells, thereby reducing the thermal interaction that may be generated by close contact and reducing the risk of heat transfer between the battery cells.

[0052] Similarly, a silicon foam 122 is also provided between two adjacent second battery cells 106. This design also serves to separate the battery cells and prevent thermal interaction, further improving the safety and stability of the battery module.

[0053] As a high molecular elastomer material with multiple pores, low mass and density, and resistance to compression and deformation, the silicone foam 122 has good sealing properties. Therefore, the silicone foam 122 can effectively seal the gaps between battery cells, preventing external contaminants such as dust and moisture from entering the battery cells, thereby protecting the battery cells from damage.

[0054] In addition, by filling the gaps between the cells, the silicon foam 122 effectively reduces the thermal interaction between the cells and prevents the accumulation of heat between the cells, thereby improving the safety and stability of the battery module. The buffering, anti-skid and shockproof properties of the silicon foam 122 can provide all-round protection for the cells, preventing the cells from being impacted and damaged during driving. The sealing properties of the silicon foam 122 can effectively prevent external contaminants from entering the cells, protecting the cells from damage.

[0055] According to an embodiment of the present invention, an isolation plate is disposed between the first battery cell group 100 and the second battery cell group 104 .

[0056] An isolation plate is specially provided between the first battery cell group 100 and the second battery cell group 104. The primary function of the isolation plate is to ensure electrical isolation between the first battery cell group 100 and the second battery cell group 104. This helps prevent safety risks caused by short circuits or abnormal current flow between the battery cells. Through the effective isolation of the isolation plate, the electrical safety inside the battery module is significantly improved, reducing the potential risks caused by electrical failures.

[0057] The presence of the isolation plate not only provides electrical isolation, but also can enhance the overall structural stability of the battery module to a certain extent. At the same time, the setting of the isolation plate also helps to fix the battery cell group to prevent the battery cell from displacement or deformation under vibration or impact conditions, thereby improving the service life and reliability of the battery module.

[0058] Isolators are usually made of materials with excellent insulation properties and mechanical strength, such as epoxy boards, etc. These materials not only have good electrical isolation properties, but can also withstand certain pressure and impact, ensuring the stability and safety of the battery module under various environmental conditions.

[0059] According to an embodiment of the present invention, the first epoxy board 108 is provided with wire holes 124 , and the number of the wire holes 124 corresponds to the number of the first battery cells 102 and the second battery cells 106 .

[0060] like Figure 4As shown, the main purpose of opening the wire hole 124 on the first epoxy board 108 is to facilitate the electrical connection between the first battery cell group 100 and the second battery cell group 104, while ensuring a compact structure, reasonable wiring, and reducing electromagnetic interference and heat accumulation.

[0061] The number of the wire holes 124 corresponds to the number of the first battery cells 102 and the second battery cells 106. That is, each battery cell has a corresponding wire hole 124 for electrical connection, ensuring that each battery cell can obtain an effective electrical path. The layout of the wire holes 124 needs to take into account factors such as the arrangement of the battery cell group, the electrical connection path, and heat dissipation. Usually, the wire holes 124 are evenly distributed on the first epoxy board 108 and coordinated with the layout of the battery cell group to reduce the wiring length and complexity.

[0062] In order to reduce electromagnetic interference, an electromagnetic shielding structure, such as a metal shielding layer or a conductive coating, may be provided around the wire hole 124. These structures can effectively isolate the electromagnetic field and improve the electromagnetic compatibility of the system.

[0063] The layout of the wire holes 124 can take heat dissipation requirements into consideration. For example, heat dissipation channels or heat dissipation holes can be set between the battery cell groups and around the wire holes 124 to help dissipate the heat generated by the battery cells and improve the heat dissipation performance of the system.

[0064] According to an embodiment of the present invention, a busbar 126 is mounted on the first epoxy board 108 , and the first pole lug and the second pole lug are connected to the busbar 126 ; and a wiring harness terminal 128 is connected to the busbar 126 .

[0065] like Figure 1 As shown, a busbar 126 is installed on the first epoxy board 108. The busbar 126 is a device for collecting the current of multiple battery cells together, and is usually used in battery modules to improve the output efficiency of the current. The first pole ear and the second pole ear are respectively connected to the busbar 126. The first pole ear and the second pole ear are metal sheets on the first battery cell 102 and the second battery cell 106 for connecting to the external circuit, and are usually divided into positive pole ears and negative pole ears. Here, the first pole ear and the second pole ear may refer to the positive and negative poles from different battery cells. A wiring harness terminal 128 is connected to the busbar 126. The wiring harness terminal 128 is a device for connecting wires or cables. It usually has a fixed wire clamp that can firmly connect the wires and the busbar 126. The use of the wiring harness terminal 128 can ensure that the connection between the wires and the busbar 126 is stable and reliable, and is not easy to loosen or disconnect.

[0066] like Figure 6 As shown, a second embodiment of the present invention provides a battery pack, including the above-mentioned battery module.

[0067] According to the battery pack provided by the embodiment of the second aspect of the utility model, due to the stacking design of the battery cells inside the battery module, the entire battery pack can accommodate more battery cells in a limited volume, thereby improving the energy density of the battery pack and meeting the power requirements of high-performance equipment. The structural design inside the battery module helps to evenly distribute and quickly dissipate heat, which enables the battery pack to maintain a lower temperature when working under high load, prolong battery life, and improve safety performance. The battery pack can further improve the safety performance of the battery pack and reduce safety accidents caused by battery failure by adding safety measures such as thermal management system and overcharge and over-discharge protection.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A battery module, characterized in that: include: A first battery cell group (100) comprises a plurality of first battery cells (102), wherein the plurality of first battery cells (102) are stacked in a longitudinal direction; A second battery cell group (104) comprising a plurality of second battery cells (106), wherein the plurality of second battery cells (106) are stacked in a transverse direction; A first epoxy plate (108) is arranged on one side of the first battery cell group (100) and the second battery cell group (104); a first electrode tab of the first battery cell group (100) and a second electrode tab of the second battery cell group (104) are welded to the first epoxy plate (108).

2. The battery module according to claim 1, characterized in that: The outer sides of the first battery cell group (100) and the second battery cell group (104) are coated with polyurethane foam (110), and the outer sides of the polyurethane foam (110) are bonded with a second epoxy board (112).

3. The battery module according to claim 2, characterized in that: The outer side of the second epoxy plate (112) is bonded with EVA foam (114).

4. The battery module according to claim 1, characterized in that: A bracket (116) is arranged on the outer side of the first battery cell group (100), and a communication board (118) and a protection board (120) are detachably connected to the bracket (116).

5. The battery module according to any one of claims 1 to 4, characterized in that: Silicon foam (122) is arranged between two adjacent first battery cells (102) and / or between two adjacent second battery cells (106).

6. The battery module according to any one of claims 1 to 4, characterized in that: An isolation plate is provided between the first battery cell group (100) and the second battery cell group (104).

7. The battery module according to any one of claims 1 to 4, characterized in that: The first epoxy board (108) is provided with wire holes (124), and the number of the wire holes (124) corresponds to the number of the first battery core (102) and the second battery core (106).

8. The battery module according to claim 7, characterized in that: A busbar (126) is mounted on the first epoxy board (108), and the first electrode tab and the second electrode tab are connected to the busbar (126).

9. The battery module according to claim 8, characterized in that: The busbar (126) is connected to a wiring harness terminal (128).

10. A battery pack, characterized in that: A battery module comprising the battery module as claimed in any one of claims 1 to 9.

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